7.2. Access Control and Encapsulation

At this point, we have defined an interface for our class; but nothing forces users to use that interface. Our class is not yet encapsulated—users can reach inside a Sales_data
object and meddle with its implementation. In C++ we use access specifiers to enforce encapsulation:
• Members defined after a public
specifier are accessible to all parts of the program. The public
members define the interface to the class.
• Members defined after a private
specifier are accessible to the member functions of the class but are not accessible to code that uses the class. The private
sections encapsulate (i.e., hide) ...
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